Molecular Behavior of Different Polycarboxylate Superplasticizers

Four different types of polycarboxylic superplasticizers were synthesized by using different macromonomers, and then the molecular behavior of GPC, infrared, nuclear magnetic, cement hydration heat and micromorphology were characterized. The results showed that different types of PCEs have different molecular behaviors. The research showed that the molecular weight and molecular weight distribution of PCE1 were the smallest, and these four different types of PCEs have better molecular weight and molecular weight distribution. The infrared spectra of the four PCEs were not much different. However, by ¹H NMR, the macromonomer used in PCE1 when synthesised was MPEG. The macromonomer used in PCE2 and PCE4 when synthesised were TPEG, and the macro monomer used in PCE3 was HPEG. Cement hydration heat and scanning electron microscope data showed that PCE4 has the better early strength. (paper)